ProMinent Hydro/4 Operating Instructions Manual page 23

WARNING!
Warning of feed chemical reactions to water
Feed chemicals that should not come into contact with water
may react to residual water in the liquid end that may origi‐
nate from works testing.
– Blow the liquid end dry with compressed air through the
suction connector.
– Then flush the liquid end with a suitable medium through
the suction connector.
WARNING!
The following measures are an advantage when working with
highly aggressive or hazardous feed chemicals:
– Install a bleed valve with recirculation in the storage
tank.
– Install an additional shut-off valve on the discharge or
suction ends.
CAUTION!
Warning of backflow
A back pressure valve or a spring-loaded injection valve do
not represent absolutely leak-tight closing elements.
– For this purpose use a shut-off valve, a solenoid valve or
a vacuum breaker.
CAUTION!
Suction problems possible
The valves may no longer close properly with feed chemicals
with a particle size of greater than 0.3 mm.
– Install a suitable filter in the suction line.
CAUTION!
Warning of the discharge line bursting
With a closed discharge line (e.g. from a clogged discharge
line or by closing a valve), the pressure that the metering
pump generates can reach several times more than the per‐
missible pressure of the system or the metering pump. This
could lead to lines bursting resulting in dangerous conse‐
quences with aggressive or hazardous feed chemicals.
– Install a relief valve that limits the pressure of the pump
to the maximum permissible operating pressure of the
system.
CAUTION!
Warning of the discharge line bursting
Hose lines with insufficient pressure rating may burst.
– Only use hose lines with the required pressure rating.
Installation
23